KR101498086B1 - Method of avoiding idc interference in a wireless communication system and apparatus for same - Google Patents

Method of avoiding idc interference in a wireless communication system and apparatus for same Download PDF

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Publication number
KR101498086B1
KR101498086B1 KR1020127031756A KR20127031756A KR101498086B1 KR 101498086 B1 KR101498086 B1 KR 101498086B1 KR 1020127031756 A KR1020127031756 A KR 1020127031756A KR 20127031756 A KR20127031756 A KR 20127031756A KR 101498086 B1 KR101498086 B1 KR 101498086B1
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South Korea
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idc
information
terminal
method
state
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KR1020127031756A
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Korean (ko)
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KR20130106771A (en
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이재욱
천성덕
이승준
정성훈
이영대
박성준
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엘지전자 주식회사
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Priority to US37423610P priority Critical
Priority to US61/374,236 priority
Priority to US39474210P priority
Priority to US61/394,742 priority
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to PCT/KR2011/005829 priority patent/WO2012023734A2/en
Publication of KR20130106771A publication Critical patent/KR20130106771A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/08Testing, supervising or monitoring using real traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02Transmitters
    • H04B1/04Circuits
    • H04B1/0475Circuits with means for limiting noise, interference or distortion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference induced by transmission
    • H04B1/12Neutralising, balancing, or compensation arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/04Arrangements for maintaining operational condition
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation where an allocation plan is defined based on the type of the allocated resource
    • H04W72/0453Wireless resource allocation where an allocation plan is defined based on the type of the allocated resource the resource being a frequency, carrier or frequency band
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/08Wireless resource allocation where an allocation plan is defined based on quality criteria
    • H04W72/082Wireless resource allocation where an allocation plan is defined based on quality criteria using the level of interference
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/20Manipulation of established connections
    • H04W76/27Transitions between radio resource control [RRC] states

Abstract

In this application, a method for transmitting an IDC (In-Device Coexistence) interference information to a base station in a wireless communication system is disclosed. Performing quality measurement using the quality measurement setup information when the operation of one or more second communication modules coexisting in the terminal is recognized; Setting a frequency at which the quality measurement process is performed to an unusable frequency due to the IDC interference if the quality value is less than or equal to a threshold value; and transmitting information on the unusable frequency to the base station do.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for avoiding IDC interference in a wireless communication system,

The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and apparatus for avoiding IDC (In-Device Coexistence) interference in a wireless communication system.

As an example of a wireless communication system to which the present invention can be applied, a 3GPP LTE (Third Generation Partnership Project) Long Term Evolution (LTE) communication system will be schematically described.

1 is a diagram schematically showing an E-UMTS network structure as an example of a wireless communication system. The Evolved Universal Mobile Telecommunications System (E-UMTS) system evolved from the existing Universal Mobile Telecommunications System (UMTS), and is currently undergoing basic standardization work in 3GPP. In general, E-UMTS may be referred to as an LTE (Long Term Evolution) system. For details of the technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of "3rd Generation Partnership Project (Technical Specification Group Radio Access Network)" respectively.

1, an E-UMTS includes an Access Gateway (AG) located at the end of a User Equipment (UE), a Node B (eNode B), and an E-UTRAN, . The base station may simultaneously transmit multiple data streams for broadcast services, multicast services, and / or unicast services.

One base station has more than one cell. The cell is set to one of the bandwidths of 1.25, 2.5, 5, 10, 15, 20Mhz and the like to provide downlink or uplink transmission service to a plurality of UEs. Different cells may be set up to provide different bandwidths. The base station controls data transmission / reception for a plurality of terminals. The base station transmits downlink scheduling information for downlink (DL) data, and notifies the UE of time / frequency region, coding, data size, and HARQ related information to be transmitted to the UE. In addition, the base station transmits uplink scheduling information to uplink (UL) data, and notifies the UE of time / frequency domain, coding, data size, and HARQ related information that the UE can use. An interface for transmitting user traffic or control traffic may be used between the base stations. The Core Network (CN) can be composed of an AG and a network node for user registration of the UE. The AG manages the mobility of the terminal in units of TA (Tracking Area) composed of a plurality of cells.

Wireless communication technologies have been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing. In addition, since other wireless access technologies are continuously being developed, new technology evolution is required to be competitive in the future. Cost reduction per bit, increased service availability, use of flexible frequency band, simple structure and open interface, and proper power consumption of terminal.

The present invention provides a method and apparatus for avoiding IDC interference in a wireless communication system.

A method of transmitting IDC (In-Device Coexistence) interference information to a base station by a first communication module of a terminal in a wireless communication system, which is an aspect of the present invention, includes: receiving quality measurement setting information from a base station; Performing a quality measurement process using the quality measurement setup information when an operation of at least one second communication module coexisting in the terminal is recognized; Setting a frequency at which the quality measurement process is performed to an unusable frequency due to the IDC interference if the measured quality value is less than or equal to a threshold value; And transmitting information on the unusable frequency to the base station.

According to another aspect of the present invention, a terminal apparatus in a wireless communication system includes: a first communication module for transmitting and receiving signals to and from a first communication system; And at least one second communication module for transmitting and receiving signals to and from another communication system, wherein the first communication module is configured to receive quality measurement configuration information from a base station and to communicate with the at least one second communication module The in-use frequency due to the IDC (In-Device Coexistence) interference is set to a frequency at which the quality measurement is performed when the quality value measured using the quality measurement setting information is less than or equal to a threshold value, And transmits information on the unusable frequency.

Wherein the unusable frequency is a serving frequency or a non-serving frequency between the first communication module and the base station, and wherein the operation of the one or more second communication modules is a non- 2 communication module or a traffic transmission / reception operation of the one or more second communication modules.

In addition, the frequency band corresponding to the first communication module and the frequency band corresponding to the at least one second communication module may be close to a predetermined value or less, and the at least one second communication module may transmit / receive for the WiFi system Module, a Bluetooth transmission / reception module, and a Global Positioning System (GPS) reception module.

More preferably, the first communication module is in an RRC (Radio Resource Control) connection (RRC_CONNECTED) state with the base station.

According to the embodiments of the present invention as described above, the terminal can effectively avoid IDC interference.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 schematically shows an E-UMTS network structure as an example of a wireless communication system.
FIG. 2 conceptually illustrates a network structure of an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). FIG.
3 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard.
FIG. 4 illustrates a terminal including a wireless communication module for an LTE system, a global positioning system (GPS), and a BT / WiFi system, respectively.
5 is a flow diagram illustrating a method for avoiding IDC interference, in accordance with a first embodiment of the present invention;
6 is a flow chart illustrating a method for avoiding IDC interference, in accordance with a fourth embodiment of the present invention.
7 is a flowchart showing another method of avoiding IDC interference, according to a fourth embodiment of the present invention;
8 illustrates a block diagram of a communication transceiver according to an embodiment of the present invention.

Hereinafter, the structure, operation and other features of the present invention will be readily understood by the embodiments of the present invention described with reference to the accompanying drawings. The embodiments described below are examples in which technical features of the present invention are applied to a 3GPP system.

Although the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, embodiments of the present invention may be applied to any communication system corresponding to the above definition. In addition, although the present invention is described with reference to the FDD scheme, the embodiments of the present invention can be easily modified to the H-FDD scheme or the TDD scheme.

2 is a conceptual diagram illustrating a network structure of an evolved universal terrestrial radio access network (E-UTRAN). Especially, the E-UTRAN system is an evolved system in the existing UTRAN system. The E-UTRAN is composed of cells (eNBs), and the cells are connected via the X2 interface. The cell is connected to the terminal through the air interface, and is connected to the EPC (Evolved Packet Core) through the S1 interface.

EPC is composed of MME (Mobility Management Entity), S-GW (Serving-Gateway) and PDN-GW (Packet Data Network-Gateway). The MME has information on the access information of the terminal or the capability of the terminal, and this information is mainly used for managing the mobility of the terminal. The S-GW is a gateway having an E-UTRAN as an end point, and the PDN-GW is a gateway having a PDN (Packet Data Network) as an end point.

3 is a diagram showing a control plane and a user plane structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard. The control plane refers to a path through which control messages used by a UE and a network are transferred. The user plane means a path through which data generated in the application layer, for example, voice data or Internet packet data, is transmitted.

The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a medium access control layer (upper layer) through a transport channel. Data moves between the MAC layer and the physical layer over the transport channel. Data is transferred between the transmitting side and the receiving side physical layer through the physical channel. The physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in an OFDMA (Orthogonal Frequency Division Multiple Access) scheme in a downlink, and is modulated in an SC-FDMA (Single Carrier Frequency Division Multiple Access) scheme in an uplink.

The Medium Access Control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is an upper layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a functional block in the MAC. The Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce unnecessary control information in order to efficiently transmit IP packets such as IPv4 and IPv6 in a wireless interface with a narrow bandwidth.

The Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only in the control plane. The RRC layer is responsible for the control of logical channels, transport channels and physical channels in connection with the configuration, re-configuration and release of radio bearers (RBs). RB denotes a service provided by the second layer for data transmission between the UE and the network. To this end, the terminal and the RRC layer of the network exchange RRC messages with each other.

One cell constituting the base station eNB is set to one of the bandwidths of 1.25, 2.5, 5, 10, 15, 20Mhz and the like to provide a downlink or uplink transmission service to a plurality of terminals. Different cells may be set up to provide different bandwidths.

A downlink transmission channel for transmitting data from a network to a terminal includes a BCH (Broadcast Channel) for transmitting system information, a PCH (Paging Channel) for transmitting a paging message, a downlink SCH (Shared Channel) for transmitting user traffic or control messages, have. In case of a traffic or control message of a downlink multicast or broadcast service, it may be transmitted through a downlink SCH, or may be transmitted via a separate downlink multicast channel (MCH).

Meanwhile, the uplink transmission channel for transmitting data from the UE to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink SCH (shared channel) for transmitting user traffic or control messages. A logical channel mapped to a transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH) Traffic Channel).

Hereinafter, the RRC state of the UE and the RRC connection method will be described. The RRC state refers to whether or not the RRC of the UE is a logical connection with the RRC of the E-UTRAN. If the RRC is connected, the RRC connection state (RRC_CONNECTED) is established. If not, the RRC idle state (RRC_IDLE) .

Since the E-UTRAN can grasp the presence of the UE in the RRC-connected state on a cell-by-cell basis, the E-UTRAN can effectively control the UE. On the other hand, the E-UTRAN can not grasp the RRC idle terminal in the cell unit, and the CN manages the TA unit, which is a larger area unit than the cell. That is, in order for the UE in the RRC idle state to receive services such as voice or data from the cell, the UE must transition to the RRC connected state.

In particular, when the user first turns on the power of the UE, the UE first searches for an appropriate cell and stays in the RRC idle state in the cell. The UE which has stayed in the RRC idle state performs the RRC connection establishment process with the RRC of the E-UTRAN only when it is necessary to establish the RRC connection, and transits to the RRC connection state. Here, the case where the RRC connection needs to be established means that uplink data transmission is required due to a user's call attempt or the like, or when a paging message is received from the E-UTRAN, a response message should be transmitted.

Now we will explain the measurement and measurement report.

In the following description, 'measurement' is a process of receiving a reference signal received from cells located in the inter-frequency, intra-frequency and inter-RAT according to the measurement setting received from the network, Can be defined as measuring the quality value. In the following description, 'quality' means a signal quality or a cell quality that is recognized through a reference signal received from a measurement target cell.

In support of mobility support of a mobile station in a mobile communication system, a mobile station continuously maintains a quality of a serving cell and a quality of a neighboring cell providing a current service, at least in a discontinuous reception (DRX ) Measure every cycle. The terminal reports the cell quality measurement result to the network at an appropriate time, and the network provides optimal mobility to the terminal through handover or the like.

In addition to mobility support, the terminal may perform a specific purpose measurement set by the network and report the cell quality measurement results to the network in order to provide information that may help the operator to operate the network. For example, the terminal receives broadcast information of a specific cell set by the network. The terminal may store a cell identifier of the particular cell (also referred to as a global cell identifier), location identification information (e.g., Tracking Area Code) to which the particular cell belongs and / For example, whether it is a member of a closed subscriber group (CSG) cell).

If the mobile terminal confirms that the quality of a specific area is very bad, it can report the location information of the poor quality cells and the cell quality measurement result to the network. The network can optimize the network based on the report of the cell quality measurement result of the terminals that help the network operation.

In a mobile communication system with a frequency reuse factor of 1, mobility is mostly between different cells in the same frequency band. Therefore, in order to ensure mobility of the UE, the UE must be able to measure the quality and cell information of neighbor cells having the same center frequency as the center frequency of the serving cell. The measurement for a cell having the same center frequency as the center frequency of the serving cell is called an intra-frequency measurement. The terminal performs in-cell measurement to report the cell quality measurement result to the network at an appropriate time so that the purpose of the corresponding cell quality measurement result is achieved.

The mobile communication service provider may operate the network using a plurality of frequency bands. In a case where a service of a communication system is provided through a plurality of frequency bands, in order to guarantee optimal mobility to the UE, the UE can measure the quality and cell information of neighboring cells having center frequencies different from the center frequency of the serving cell . Thus, a measurement on a cell having a center frequency different from the center frequency of the serving cell is called inter-frequency measurement. The terminal should be able to report cell quality measurement results to the network at an appropriate time by performing intercell measurements.

If the UE supports measurements on a heterogeneous network, measurements may be made on the cells of the heterogeneous network by setting the BS. Such measurements on heterogeneous networks are referred to as inter-RAT (Radio Access Technology) measurements. For example, the RAT may include UTRAN (UMTS Terrestrial Radio Access Network) and GERAN (GSM EDGE Radio Access Network) conforming to the 3GPP standard, and may also include a CDMA 2000 system conforming to the 3GPP2 standard.

Hereinafter, IDC (In-Device Coexistence) and IDC interference will be described.

In order to allow a user to access the various networks anytime and anywhere, it is necessary to mount a Global Navigation Satellite System (GNSS) receiver in addition to a transceiver for a wireless communication system such as LTE, WiFi, Bluetooth (BT) The coexistence of different wireless communication systems in one terminal is referred to as IDC (In-Device Coexistence). For example, it is equipped with LTE and BT module to receive VoIP service and multimedia service using BT earphone, terminal equipped with LTE and WiFi module to distribute traffic, GNSS and LTE module to acquire additional location information A terminal, and the like.

FIG. 4 illustrates a terminal including a wireless communication module for an LTE system, a global positioning system (GPS), and a BT / WiFi system, respectively.

Referring to FIG. 4, in the case of the above-described terminal, since a plurality of transceivers are close to each other in one terminal, the power of a signal transmitted from one transmitter may be greater than the power of a signal received by another receiver. In such a case, interference may occur between different communication modules, which is referred to as IDC interference. If the IDC interference becomes worse, a ping-pong phenomenon may occur that continuously attempts handover even though there is no problem in connection with the base station.

In general, the communication modules operate at adjacent frequencies as follows in terms of frequency, thereby giving mutual interference.

The LTE module operates at TDD Band 40 (2300MHz to 2400MHz) and the WiFi module or Bluetooth module can operate at the unlicensed band (2400MHz ~ 2483.5MHz). In this case, transmission of the LTE module may interfere with the WiFi module or Bluetooth module, and transmission from the WiFi module or the Bluetooth module may interfere with reception of the LTE module.

In addition, the LTE module performs the uplink transmission in the FDD Band 7 (2500 MHz to 2700 MHz), and the Bluetooth module can operate in the license-exempt band 2400 MHz to 2483.5 MHz. In this case, the uplink transmission in the LTE module may interfere with the reception of the WiFi module or the Bluetooth module.

Also, if the LTE module operates in FDD Band 13 (UL: 777-787 MHz, DL: 746-756 MHz) or FDD Band 14 (UL: 788-798 MHz, DL: 758-768 MHz) MHz to receive position information. In this case, uplink transmission in the LTE module may interfere with reception of the position information of the GPS module.

As one solution to this problem, it is possible to prevent the IDC interference between the two transceivers from occurring by ensuring a sufficient interval in the frequency between the physical filter and each transmission / reception signal. However, it is true that, when various wireless communication modules operate at an adjacent frequency, it is difficult to expect sufficient interference suppression as a current filter technology.

Apart from the method of applying the physical filter technique, the IDC interference avoidance technique is used to determine whether there is coordination with other communication modules coexisting with the LTE module and whether there is cooperation for eliminating IDC interference between the LTE module and the base station There are three cases to consider depending on whether or not.

First, there is no cooperation between the communication modules coexisting in one terminal and between the LTE module and the base station for IDC interference avoidance. In this case, the LTE module does not know information about other coexisting communication modules.

The second is a case where there is only cooperation between communication modules coexisting within the terminal. In this case, the operating state (i.e., ON / OFF state) between the coexisting modules, the traffic transmission state, and the like can be known.

Finally, cooperation exists not only between the coexistence modules in the terminal but also between the terminal and the base station. The LTE module can measure IDC interference through measurement as well as cooperation with other modules. In this case, not only can the operating state and the traffic transmission state of coexisting modules be known, but also the terminal informs the base station of the IDC interference state, so that the base station makes a decision to avoid the IDC interference of the terminal and takes action.

Currently, in 3GPP, as a direction for solving the IDC interference, there is a method of 1) a method in which a communication module giving interference or a communication module receiving interference changes frequencies (Frequency Division Multiplexing (FDM)), 2) (Time Division Multiplexing; TDM), 3) LTE module is considering LTE power control (LTE PC) to reduce interference to other coexisting modules by controlling transmission power, Specific methods and procedures are currently being discussed in 3GPP.

As described above, in order for the IDC interference control scheme to operate efficiently, it is necessary to cooperate with the base station. In other words, it is necessary to cooperate with the handover to move the frequency used to avoid the IDC interference to another frequency, and the scheduling of the base station to use the divided time resources. However, since the IDC interference occurs in one terminal, the BS may not know that the IDC interference has been issued to the terminal, and the BS can not recognize the IDC interference generated in the terminal, The quality of service (QoS) of a service using an LTE system or other coexisting communication system may be seriously degraded. Therefore, in order for the base station to take appropriate measures against the IDC interference occurring in the terminal, the terminal needs to inform the base station of the IDC interference information.

Accordingly, the present invention provides a method for avoiding interference caused by simultaneous operation of an LTE transceiver and another communication transceiver in an adjacent terminal at an adjacent frequency, wherein the LTE transceiver is classified into a case where interference occurs or a case where interference is expected to occur Explain. The following four examples are presented as specific interference avoidance methods.

≪ Embodiment 1 >

The first embodiment of the present invention is a case where there is only cooperation between communication modules coexisting in the terminal. If the LTE module is expected to cause mutual interference due to coexistence with other communication modules in the terminal, And excludes unusable frequencies from cell selection when concatenated.

The unusable frequency may be defined as the frequency of the LTE system that may interfere with other communication modules due to the operation of the LTE module or a frequency at which the LTE module may receive interference when another communication module operates. In this case, it is assumed that the LTE module knows the existence of another coexisting communication module and knows the unavailable frequencies due to the coexisting communication module. Therefore, if the frequency used by the LTE module and another communication module is close to or below a predetermined threshold, the LTE module expects the interference to occur.

5 is a flowchart showing a method for avoiding IDC interference according to the first embodiment of the present invention.

Referring to FIG. 5, if an LTE module generates an event for an RRC connection attempt with a base station in step 501, the LTE module determines in step 502 that the system frequency camped in the RRC_IDLE state is not usable frequency (unusable frequency).

In this case, if the system frequency is not an unusable frequency, the LTE module performs an RRC connection procedure with the base station in step 503. However, if the system frequency is an unusable frequency, the LTE module reselects a cell of a new system frequency that is not a usable frequency, and performs an RRC connection procedure with the corresponding cell in step 504 .

≪ Embodiment 2 >

The second embodiment of the present invention is a case where cooperation exists between a UE and a base station as well as between coexistence modules in a UE. In a case where mutual interference is expected to occur due to coexistence with another communication module in the UE And transmits the capability information of the coexistence system to the base station so that the base station can grasp the potential interference of the terminal.

Specifically, when an LTE module in an RRC idle state establishes an initial RRC connection with a base station, the base station transmits capability information of the UE to the base station, so that the base station can grasp the IDC interference of the UE that may occur in the future. In this case, if the frequency used by the LTE module and another communication module is close to a predetermined value or less, the base station expects IDC interference in the LTE module.

In addition, the LTE module adds information about the communication module or the communication system coexisting in the message " UECapabilityInformation " for transmitting the performance information, the frequency used by the coexisting communication system, can do. The unusable frequency can be defined as the frequency of the LTE system that may interfere with other communication modules due to the operation of the LTE module or a frequency at which the LTE module can receive interference when another communication module operates have.

≪ Third Embodiment >

The third embodiment of the present invention is a case where cooperation exists between a UE and a base station as well as coexistence between coexistence modules in the UE. The LTE module in the RRC_CONNECTED state with the base station coexists with other communication modules in the UE And transmits information on whether or not the other communication module is operating to the base station when it is expected that mutual interference will occur.

Here, the case where the mutual interference is expected to occur is a case where the communication module of another coexisting system operates (that is, when the frequency used by the LTE module and the other communication module in the RRC connected state is below the threshold value as described above , Transition to the ON state), or traffic transmission, the LTE module expects interference due to coexistence with other systems.

The information on whether or not the other communication module operates may include information on the coexistent communication module or communication system, frequency used by the coexisting communication system, transmission / reception power information of the coexisting communication module, have. The unusable frequency may be a serving frequency or a non-serving frequency of an LTE system that may interfere with other communication modules due to the operation of the LTE module, Can be defined as the frequency that can be received.

<Fourth Embodiment>

Unlike the other embodiments described above, the fourth embodiment of the present invention relates to a situation in which actual IDC interference occurs due to coexistence with another communication module in the LTE module in the RRC connected state, When there is cooperation between the terminal and the base station, information on the unavailable frequency, which is a frequency that is difficult to use by the LTE module connected to the RRC due to the IDC interference, is transmitted to the base station.

The unusable frequency in the fourth embodiment is a serving frequency or a non-serving frequency of an LTE system in which severe interference with a current threshold value or more due to traffic transmission of other coexisting systems occurs, It is possible to define the frequency of the LTE system that generates interference with a current communication module by more than a predetermined threshold value due to the operation of the LTE module. The information on the unusable frequency may be added to the existing measurement result report message, To the base station.

6 is a flow chart illustrating a method for avoiding IDC interference, according to a fourth embodiment of the present invention. In particular, FIG. 6 shows an example in which a WiFi module and an LTE module operate in adjacent terminals in a single terminal, and IDC interference detection is assumed to be possible through cooperation between a WiFi module and an LTE module.

Referring to FIG. 6, when the power of the WiFi module transits to the ON state as in step 601, the terminal considers that IDC interference has occurred. In this case, the WiFi module internally informs the LTE module of the operation frequency, transmission power, and the like of the WiFi module in step 602 so that the LTE module can acquire IDC interference information.

In step 603, the LTE module acquires frequency information, which is unusable or unusable due to IDC interference, from the information received from the WiFi module. Then, in step 603, And the like.

Finally, the base station receiving the information on the unusable frequency may apply at least one of the measures for avoiding IDC interference, that is, measures such as FDM, TDM, and LTE PC described above in step 604.

7 is a flow chart illustrating another method of avoiding IDC interference, according to a fourth embodiment of the present invention. In particular, in FIG. 7, it is assumed that detection of IDC interference is possible through a measurement process of an LTE module.

First, the LTE module of the terminal receives information on the measurement setting from the base station eNB as in step 701. [ If the WiFi module transits to the ON state or the traffic occurs as in step 702, the LTE module performs a measurement process based on the measurement setup information in step 703, and if an interference of a predetermined threshold value or more occurs , Or if signal strength below a certain threshold (e.g., SINR) is measured, then IDC interference is considered to have occurred.

Then, the LTE module transmits the information on the unavailable frequency obtained through the measurement process to the base station in step 704. Finally, the base station, which has received the information on the unavailable frequency, , And measures such as FDM, TDM, and LTE PC described above can be applied.

In summary, according to the fourth embodiment of the present invention, when an IDC interference occurs in a terminal, the terminal notifies the base station of information on the unusable frequency, so that the base station obtains information on the unusable frequency received from the terminal It is possible to quickly take an FDM, TDM, or LTE PC scheme to avoid IDC interference at the terminal. Therefore, it is possible to prevent a severe QoS degradation that may occur due to IDC interference in one terminal.

8 illustrates a block diagram of a communication transceiver according to an embodiment of the present invention. The transceiver may be part of a base station or a terminal.

8, the transceiver 800 includes a processor 810, a memory 820, an RF module 830, a display module 840, and a user interface module 850.

The transceiver 800 is shown for convenience of description and some modules may be omitted. In addition, the transceiver 800 may further include a necessary module. Also, in the transceiver 800, some modules may be further divided into more detailed modules. The processor 820 is configured to perform operations according to embodiments of the present invention illustrated with reference to the drawings.

Specifically, when the transceiver 800 is part of a base station, the processor 820 may generate a control signal and map the control signal to a control channel set in a plurality of frequency blocks. In addition, when the transceiver 800 is part of a terminal, the processor 820 can identify the control channel indicated to it from the signals received from the plurality of frequency blocks and extract the control signal therefrom.

The processor 820 may then perform the required operation based on the control signal. The detailed operation of the processor 820 may refer to the contents described in Figs. 1 to 7.

The memory 820 is coupled to the processor 810 and stores an operating system, application, program code, data, and the like. The RF module 830 is connected to the processor 810 and performs a function of converting a baseband signal into a radio signal or a radio signal into a baseband signal. To this end, the RF module 830 performs analog conversion, amplification, filtering, and frequency up-conversion, or inverse thereof. Display module 840 is coupled to processor 810 and displays various information. Display module 840 may use well-known elements such as, but not limited to, a Liquid Crystal Display (LCD), a Light Emitting Diode (LED), and an Organic Light Emitting Diode (OLED). The user interface module 850 is connected to the processor 810 and may be configured as a combination of well known user interfaces such as a keypad, a touch screen, and the like.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

In this document, the embodiments of the present invention have been mainly described with reference to the data transmission / reception relationship between the terminal and the base station. The specific operation described herein as being performed by the base station may be performed by its upper node, in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the terminal may be replaced by terms such as a UE (User Equipment), a Mobile Station (MS), and a Mobile Subscriber Station (MSS).

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Industrial availability

Although the method and apparatus for suppressing IDC interference in the above-described wireless communication system have been described with reference to the example applied to the 3GPP LTE system, it is possible to apply the present invention to various wireless communication systems other than the 3GPP LTE system.

Claims (20)

  1. A method for a terminal to communicate with a network in a wireless communication system,
    Receiving configuration information from the network; And
    And initiating transmission of information on the detected IDC state to the network upon detecting an IDC (In Device Coexistence) state according to the setting information,
    The information on the detected IDC state includes frequency information associated with the detected IDC problem,
    The transmission includes:
    Characterized in that the terminal is started after the terminal fails to resolve the detected IDC state by itself.
    Communication method.
  2. delete
  3. The method according to claim 1,
    The detected IDC failure may include,
    The IDC frequency interference between at least two devices in the terminal.
    Communication method.
  4. The method according to claim 1,
    The detection of the IDC state may include,
    And the detection of the IDC state change.
    Communication method.
  5. The method of claim 3,
    Wherein the IDC failure is detected while the terminal is in an RRC (Radio Resource Control) connection (RRC_CONNECTED) state.
    Communication method.
  6. The method according to claim 1,
    The information on the detected IDC state is,
    The frequency information and other information related to the detected IDC failure.
    Communication method.
  7. The method according to claim 1,
    The setting information includes:
    IDC monitoring information and &lt; RTI ID = 0.0 &gt; IDC &lt; / RTI &gt; reporting information.
    Communication method.
  8. delete
  9. The method according to claim 1,
    Wherein,
    And frequency information relating to a corresponding measurement target.
    Communication method.
  10. The method of claim 3,
    Wherein the at least two devices,
    An LTE (Long Term Evolution) transceiver, a WiFi transceiver, and a Bluetooth transceiver.
    Communication method.
  11. A method for a network to communicate with a terminal in a wireless communication system,
    Transmitting configuration information to the terminal; And
    And receiving information on the detected IDC state from the terminal when the terminal detects an IDC (In Device Coexistence) state according to the setting information,
    The information on the detected IDC state includes frequency information associated with the detected IDC problem,
    Wherein the information about the detected IDC state is received after the terminal fails to resolve the detected IDC state by itself.
    Communication method.
  12. delete
  13. 12. The method of claim 11,
    The detected IDC failure may include,
    The IDC frequency interference between at least two devices in the terminal.
    Communication method.
  14. 12. The method of claim 11,
    The detection of the IDC state may include,
    And the detection of the IDC state change.
    Communication method.
  15. 14. The method of claim 13,
    Wherein the IDC failure is detected while the terminal is in an RRC (Radio Resource Control) connection (RRC_CONNECTED) state.
    Communication method.
  16. 12. The method of claim 11,
    The information on the detected IDC state is,
    The frequency information and other information related to the detected IDC failure.
    Communication method.
  17. 12. The method of claim 11,
    The setting information includes:
    IDC monitoring information and &lt; RTI ID = 0.0 &gt; IDC &lt; / RTI &gt; reporting information.
    Communication method.
  18. delete
  19. 12. The method of claim 11,
    Wherein,
    And frequency information relating to a corresponding measurement target.
    Communication method.
  20. 14. The method of claim 13,
    Wherein the at least two devices,
    An LTE (Long Term Evolution) transceiver, a WiFi transceiver, and a Bluetooth transceiver.
    Communication method.
KR1020127031756A 2010-08-16 2011-08-10 Method of avoiding idc interference in a wireless communication system and apparatus for same KR101498086B1 (en)

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US20160088506A1 (en) 2016-03-24
KR20130106771A (en) 2013-09-30

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